package com.example.demo.controller.dproxy;

import java.lang.reflect.*;

/**
 * @author 徐塬峰
 * @version 1.0
 * @date 2021-04-30 4:34 下午
 * @desc
 */
public class LogHandler implements InvocationHandler {
    private Object delegate;

    public Object bind(IHello delegate) {
        this.delegate = delegate;
        //生成代理对象的两种方式：

        //方式一： 类加载器，要被代理的接口，代理处理类（即InvocationHandler的实现类）
        return Proxy.newProxyInstance(delegate.getClass().getClassLoader(), delegate.getClass().getInterfaces(), this);

        //方式二
//        Class<?> proxyClass = Proxy.getProxyClass(delegate.getClass().getClassLoader(), delegate.getClass().getInterfaces());
//        Object proxyInstance = null;
//        try {
//            Constructor<?> constructor = proxyClass.getConstructor(new Class[]{InvocationHandler.class});
//            proxyInstance = constructor.newInstance(new Object[]{this});
//        } catch (NoSuchMethodException e) {
//            e.printStackTrace();
//        } catch (IllegalAccessException e) {
//            e.printStackTrace();
//        } catch (InstantiationException e) {
//            e.printStackTrace();
//        } catch (InvocationTargetException e) {
//            e.printStackTrace();
//        }
//        return proxyInstance;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("method start..." + method.getName());
        Object result = method.invoke(delegate, args);
        System.out.println("method end..." + method.getName());
        return result;
    }

    public static void main(String[] args) {
        //代理类
        LogHandler handler = new LogHandler();
        //被代理类
        IHello helloSpeaker = new HelloSpeaker();
        //绑定被代理类
        IHello speakerProxy = (IHello) handler.bind(helloSpeaker);
        speakerProxy.hello("sheting");
    }
}
